This drama is based on same title webcomic by Jo Joo Hee (writer) & Han Seung Hee (illustrator) via “Daum Webtoon” which was first published as a comic on 2012-Dec-25 by “Seoul Media Group”.

Set in an alternate Joseon dynasty, Jo Yang Sun (Lee Yoo Bi) is the daughter of a nobleman whose family loses everything when her father is framed for treason. To make ends meet, Yang Sun begins cross-dressing as a male bookseller, and meets the handsome and mysterious scholar Kim Sung Yeol (Lee Joon Ki). Sung Yeol is a vampire, and he continues to be haunted by the long-ago death of his first love Lee Myung Hee (Kim So Eun) once he meets Myung Hee’s present-day doppelgänger Choi Hye Ryung (Kim So Eun), an aloof nobleman’s daughter. Meanwhile, the evil vampire Gwi (Lee Soo Hyuk) resides in the royal palace and uses his powers and political machinations to prevent the Crown Prince Lee Yun (Shim Chang Min) from ascending the throne.

– This drama was previous lead by actor Park Hee Jin, but he declined the offer due to the schedule of filming and replaced by Lee Joon Ki after that.

– Han Groo was previously offered the lead female role, but she declined the offer and the production team invite Jin Se Yun for this role. However, Jin Se Yin also declined the offer and finally replace by Lee Yoo Bi.

– Both leads were sent to the hospital due to the injured during an early dawn shoot on 2015-June-10. Lee Jun ki injured with a fractured nose and Lee Yoo Bi with an injured back. (Source 1 & Source 2)